What is Tom going to be when he .A. grow up B. is growing up C. grows upD. will grow up

问题补充：

What is Tom going to be when he .

A. grow up

B. is growing up

C. grows up

D. will grow up

答案：

A. grow up

B. is growing up

(答案→)C. grows up

D. will grow up

解析：句意：汤姆长大以后会成为一个什么样的人。在时间状语从句和条件状语从句中，常用一般现在时代替将来时。主语为he单数第三人称，故选C。